Two together, alone against the dark.

Sent to scout the area surrounding the FURC, what Kat and Tony find among the crumbling remnants of civilization convinces them that for all the challenges they've faced inside the compound, they've had it easy. Hoping to help some of the survivors, they encounter difficulties and dangers—but the real risk they run comes from a secret aspect of their mission Tony hasn't shared with his partner, a gambit that will put the pair in extreme peril from a ruthless enemy...

The series continues with Book 5: Political Homicide and Book 6: Seismic Disruption.